The problem with Proton is it is leading many game developers to actually drop Linux support. They basically say players seem to be able to get the game to work on Proton and that's that. But with no official support there is no guarantee it will continue to work with updates. There is no promise to even try to make it work if it breaks. And that's the major stuff. Imagine spending 20, 30, or 60 dollars on a game tha…
Could you cite some examples? I know of games that have dropped Linux support (RUST, Rocket League) but those are all to do with Anti-cheat rather than citing Proton as a feasible alternative to a native port.
Supergiant has previously released all their games (Bastion, Transistor, Pyre) with Linux support. With Hades they explicitly said would not come to Linux, and in fact cite the presence of Proton as a reason [1]
Nicalis games has released games like Cave Story, VVVVVV and Binding of Isaac with Linux support. But the latest DLC of BoI will not have Linux support.
1. https://steamcommunity.com/app/1145360/discussions/0/1639794...